Feature/propagate exceptions (#3974)

* better propagation of exceptions up the stack

* remove debug testing

* refactor the watchdog more to emit data consistently at the end of the function

* enumerate a lot more terminal statuses

* handle more codes

* improve logging

* handle "-9"

* single line exception logging

* typo/grammar

---------

Co-authored-by: Richard Kuo (Danswer) <rkuo@onyx.app>

backend/onyx/connectors/connector_runner.py

@@ -76,6 +76,6 @@ class ConnectorRunner:
             )
             logger.error(
                 f"Error in connector. type: {exc_type};\n"
-                f"local_vars below -> \n{local_vars_str}"
+                f"local_vars below -> \n{local_vars_str[:1024]}"
             )
             raise